1 `/* Implementation of the CSHIFT intrinsic
2 Copyright 2003 Free Software Foundation, Inc.
3 Contributed by Feng Wang <wf_cs@yahoo.com>
5 This file is part of the GNU Fortran 95 runtime library (libgfortran).
7 Libgfortran is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either
10 version 2 of the License, or (at your option) any later version.
12 In addition to the permissions in the GNU General Public License, the
13 Free Software Foundation gives you unlimited permission to link the
14 compiled version of this file into combinations with other programs,
15 and to distribute those combinations without any restriction coming
16 from the use of this file. (The General Public License restrictions
17 do apply in other respects; for example, they cover modification of
18 the file, and distribution when not linked into a combine
21 Ligbfortran is distributed in the hope that it will be useful,
22 but WITHOUT ANY WARRANTY; without even the implied warranty of
23 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 GNU General Public License for more details.
26 You should have received a copy of the GNU General Public
27 License along with libgfortran; see the file COPYING. If not,
28 write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
29 Boston, MA 02110-1301, USA. */
35 #include "libgfortran.h"'
38 `#if defined (HAVE_'atype_name`)'
41 cshift1 (gfc_array_char * ret, const gfc_array_char * array,
42 const atype * h, const atype_name * pwhich, index_type size)
44 /* r.* indicates the return array. */
45 index_type rstride[GFC_MAX_DIMENSIONS];
50 /* s.* indicates the source array. */
51 index_type sstride[GFC_MAX_DIMENSIONS];
56 /* h.* indicates the shift array. */
57 index_type hstride[GFC_MAX_DIMENSIONS];
59 const atype_name *hptr;
61 index_type count[GFC_MAX_DIMENSIONS];
62 index_type extent[GFC_MAX_DIMENSIONS];
74 if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))
75 runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
77 if (ret->data == NULL)
81 ret->data = internal_malloc_size (size * size0 ((array_t *)array));
83 ret->dtype = array->dtype;
84 for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)
86 ret->dim[i].lbound = 0;
87 ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;
90 ret->dim[i].stride = 1;
92 ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;
100 /* Initialized for avoiding compiler warnings. */
105 for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)
109 roffset = ret->dim[dim].stride * size;
112 soffset = array->dim[dim].stride * size;
115 len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
120 extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;
121 rstride[n] = ret->dim[dim].stride * size;
122 sstride[n] = array->dim[dim].stride * size;
124 hstride[n] = h->dim[n].stride;
135 dim = GFC_DESCRIPTOR_RANK (array);
136 rstride0 = rstride[0];
137 sstride0 = sstride[0];
138 hstride0 = hstride[0];
145 /* Do the shift for this dimension. */
147 sh = (div (sh, len)).rem;
151 src = &sptr[sh * soffset];
154 for (n = 0; n < len; n++)
156 memcpy (dest, src, size);
158 if (n == len - sh - 1)
164 /* Advance to the next section. */
170 while (count[n] == extent[n])
172 /* When we get to the end of a dimension, reset it and increment
173 the next dimension. */
175 /* We could precalculate these products, but this is a less
176 frequently used path so proabably not worth it. */
177 rptr -= rstride[n] * extent[n];
178 sptr -= sstride[n] * extent[n];
179 hptr -= hstride[n] * extent[n];
183 /* Break out of the loop. */
198 void cshift1_`'atype_kind (gfc_array_char *, const gfc_array_char *,
199 const atype *, const atype_name *);
200 export_proto(cshift1_`'atype_kind);
203 cshift1_`'atype_kind (gfc_array_char * ret,
204 const gfc_array_char * array,
205 const atype * h, const atype_name * pwhich)
207 cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));
210 void cshift1_`'atype_kind`'_char (gfc_array_char * ret, GFC_INTEGER_4,
211 const gfc_array_char * array,
212 const atype * h, const atype_name * pwhich,
214 export_proto(cshift1_`'atype_kind`'_char);
217 cshift1_`'atype_kind`'_char (gfc_array_char * ret,
218 GFC_INTEGER_4 ret_length __attribute__((unused)),
219 const gfc_array_char * array,
220 const atype * h, const atype_name * pwhich,
221 GFC_INTEGER_4 array_length)
223 cshift1 (ret, array, h, pwhich, array_length);